Events are at the heart of many of our daily information sources, being microposts, newswire, calendar information or sensor data. For detecting, representing and exploiting events in these sources, different research communities are each trying to resolve a small part of this puzzle. The goal of this workshop is to bring together those different areas in the recent surge of research on the use of events as a key concept for representing and organising knowledge on the Web. The workshop invites contributions to two central questions and its goal is to formulate answers to these questions that advance and reflect the current state of understanding and application of events. Each submission will be expected to address at least one question explicitly, if possible including a system demonstration. This year, we have also made available a challenge dataset based on sensor data and we specifically invite contributions that link events in sensor data such as social web and multimedia data using semantic web technologies. The most substantial contributions to the workshop will be presented orally (and if possible with a demo) in sessions organised according to the questions addressed, with time allocated for deep discussion.